Filling for rubber tires and the like.



H. J. JOHN,

FILLING FOR RUBBER TIRES AND THE LIKE.

AYPLIOATION FILED AUG.26,1907.

906,633. Patented Dec. 15, 1908 WITNESSES. INVENTOR UNITED strarps PATENT OFFICE.

HARRY JOSEPll JOHN, OF WASHINGTON, PENNSYLVANIA, ASSIGNOR OF ONE-HALF TO LOUIS RAPHAEL, ()F PITTSBURG, PENNSYLVANIA.

FILLING FOR RUBBER TIRES AND THE LIKE.

Specification of Letters Patent.

Patented Dec. 15, 1908.

I '0 all whom it may concern:

Be it known that I, HARRY JOSEPH JOHN, a resident of Washington, in the county of Washin ton and State of Pennsylvania, have invente a new and useful Improvement in Filling for Rubber Tires and the Like; and I do hereby declare the following to be a full, cleans-and exact description thereof.

This invention relates to a composition for fillin hollow rubber and similar bodies, such as ru ber tires for all sorts of vehicles, cush ions, and the like.

The object of the invention is to provide a composition which is insoluble, non-decomposable, and which has all of the clasticityand yielding qualities of com ressed air and which avoids the expense an .inconvenience occasioned by leakage or punctures which are encountered in the use of compressed air in tires, cushions and the like. v The accompanying drawing is a cross section of a rubber tire filled with my composition, the tire being shown at l and the composition filling at 2, the latter entirely filling the tire.

B0 coloring matter to give a distinguishing color to the composition, such as a red or pink color, to serve as a mark to indicate the ori.

gin of the goods, such colorin matter bein added until the desired sha e is obtaine 85 To this li uid I add 24 parts by weight of commercia gelatin Inc. I then allow the same to stand until t e gelatin is thoroughly softened, which will take from 12 to 24 hours according to conditions. The composition ,so formed'will set but only slowly, and furthermore, is soluble either by water or .by heat and therefore not wholly desirable for my purpose as the same would leak out in case of puncture of the tire or other casin In order torender the same insoluble I a d to each 6 ounds of the composition above described t e following solution, namely:

Formaldehyde 1 oz. Oxalicacid"- 1 Hot water r 12 The formaldehyde has the property of causing the gelatin composition to set. The action is so ra id that it would not ermit the filling of t e composition into tie tire before setting. The oxalic acid retards the setting property of the gelatin, holding the same in solution for about an hour, thus enabling the tire to be filled, and also acts as a preservative for the gelatin. The solution of formaldehyde and oxalic acid is added to the composition just before filling the same into the tire, cushion or other casing.

In ractice the composition of glycerin and gelatin is first made up, and when it is to be used is laced on a water bath in order to liquefy t e same. The solution of formaldehyde and oxalic acid is then added to the composition, which is immediately pumped or otherwise filled into the tire, cushion or other casing, In about an hours time it is full set and the article is ready for use.

l he hardnessof the composition can be varied by va ing the proportions of either glycerin or ge atin glue, or both. The proportions above given are merely one example of those which may be used. By increasing the proportion of glycerin the composition when set becomes softer and by decreasing the glycerin the composition becomes harder So, too, by decreasing the proportion of goldtin glue the composition becomes softer, While by increasin the clatin-the com osition becomes her or. he hardness t erefore, can be regulated by varying the proportions of either the glycerin or of the gelatin Inc, or both.

The composition when set is insoluble and non-decomposable and is as elastic, flexible {and yielding as a very soft grade of sponge st rubber. When used as a filling for the inner tube of tires for motor cars it acts in all-particularsthe same as though the tube wese fifieci with compressed air, no diflerence being noticeable in the ease of riding of the car, The coloring matter may, of course, be entirely omitted, but I prefer to add it as it serves as a trade-mark toindicate the origin of the goods. The pro ortions of the edients can be materia y modified as above indicated and equivalents maybe employed.

What I claim is A composition for tires, cushions and the like, of a gelatinous compound, a

softening agent therefor, formaldehyde, and 15 oxalic acid. v

In testimonq1 whereof, I, the said HARRY Josmrn JOHN, ave hereunto setmy hand.

HARRY JOSEPH JOHN. Witnesses:

Jmns A. MAGILL, J. CARTER Jonson. 

